What does Alpenglow Handover Markers change?

Markers for Alpenglow fast leader handover and shred placement rules.

SIMD-0337: Alpenglow Handover Markers — Solana Activation Status

Alpenglow Handover Markers is active on Solana mainnet since epoch 1005 — activated ≈ 2 months ago.

mainnet: active since epoch 1005 · ≈ 2 months ago
testnet: active since epoch 978 · ≈ 3 months ago
devnet: active since epoch 1095 · ≈ 2 months ago

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How we know

Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.